4.6 Article

Superfluidity of metastable glassy bulk para-hydrogen at low temperature

Journal

PHYSICAL REVIEW B
Volume 85, Issue 22, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.85.224513

Keywords

-

Funding

  1. DGI (Spain) [FIS2011-25275]
  2. Generalitat de Catalunya [2009SGR-1003]

Ask authors/readers for more resources

Molecular para-hydrogen (p-H-2) has been proposed theoretically as a possible candidate for superfluidity, but the eventual superfluid transition is hindered by its crystallization. In this work, we study a metastable noncrystalline phase of bulk p-H-2 by means of the path integral Monte Carlo method in order to investigate at which temperature this system can support superfluidity. By choosing accurately the initial configuration and using a noncommensurate simulation box, we have been able to frustrate the formation of the crystal in the simulated system and to calculate the temperature dependence of the one-body density matrix and of the superfluid fraction. We observe a transition to a superfluid phase at temperatures around 1 K. The limit of zero temperature is also studied using the diffusion Monte Carlo method. Results for the energy, condensate fraction, and structure of the metastable liquid phase at T = 0 are reported and compared with the ones obtained for the stable solid phase.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

Article Physics, Multidisciplinary

Ultradilute Quantum Liquid of Dipolar Atoms in a Bilayer

G. Guijarro, G. E. Astrakharchik, J. Boronat

Summary: This study demonstrates the formation of ultradilute quantum liquids with ultracold bosonic dipolar atoms in a bilayer geometry. The proposed system uses dipolar interactions alone to create a self-bound state without the need for an additional short-range potential. Quantum Monte Carlo simulations reveal a diverse ground-state phase diagram with quantum phase transitions between liquid, solid, atomic gas, and molecular gas phases. The stabilization mechanism of the liquid phase involves an effective balance between dimer-dimer attraction and three-dimer repulsion, with the equilibrium density controlled by the interlayer distance.

PHYSICAL REVIEW LETTERS (2022)

Article Physics, Multidisciplinary

Quasiparticle Nature of the Bose Polaron at Finite Temperature

Gerard Pascual, Jordi Boronat

Summary: The Bose polaron system shows different behavior and properties at different temperatures, with a loss of quasiparticle nature close to the critical temperature. Additionally, the impurity hinders the condensation of bosons in the condensate.

PHYSICAL REVIEW LETTERS (2021)

Article Physics, Condensed Matter

Mixtures of Dipolar Gases in Two Dimensions: A Quantum Monte Carlo Study

Sergi Pradas, Jordi Boronat

Summary: The miscibility of two dipolar quantum gases at zero temperature was studied using the diffusion Monte Carlo method. The results show that the mixing between the two species is constrained by the relative dipolar moments and masses.

CONDENSED MATTER (2022)

Article Education, Scientific Disciplines

Low-energy scattering parameters: A theoretical derivation of the effective range and scattering length for arbitrary angular momentum

Jordi Pera, Jordi Boronat

Summary: The s-wave and p-wave scattering lengths and the s-wave effective range are the most important parameters in the study of low-energy scattering. By solving the scattering problem and deriving two useful formulas, we are able to calculate these parameters for any angular momentum, as long as the Wigner threshold law holds. We also analyze the behavior of the scattering parameters near Feshbach resonances and provide practical activities for learning scattering theory.

AMERICAN JOURNAL OF PHYSICS (2023)

Article Physics, Multidisciplinary

Correlation properties of a one-dimensional repulsive Bose gas at finite temperature

Giulia De Rosi, Riccardo Rota, Grigori E. Astrakharchik, Jordi Boronat

Summary: In this study, the effect of thermal fluctuations on correlations in a one-dimensional Bose gas with repulsive interactions is comprehensively investigated. The pair correlation function, static structure factor, and one-body density matrix are calculated using the exact ab-initio Path Integral Monte Carlo method for various interaction strengths and temperatures. A detailed comparison with different theoretical models is provided. The Monte Carlo results agree excellently with the tractable limits and serve as an important benchmark for future experiments in different platforms.

NEW JOURNAL OF PHYSICS (2023)

Article Multidisciplinary Sciences

Excitonic insulator to superconductor phase transition in ultra-compressed helium

Cong Liu, Ion Errea, Chi Ding, Chris Pickard, Lewis J. J. Conway, Bartomeu Monserrat, Yue-Wen Fang, Qing Lu, Jian Sun, Jordi Boronat, Claudio Cazorla

Summary: It is predicted that solid helium becomes a metal at high pressures and transitions into an excitonic insulator and a superconductor. The study reveals that helium becomes an excitonic insulator before metallization and a superconductor after metallization. These phenomena could be crucial for improving our understanding and modeling of celestial bodies.

NATURE COMMUNICATIONS (2023)

Article Optics

Quantum dynamics of dissipative Kerr solitons

Kilian Seibold, Riccardo Rota, Fabrizio Minganti, Vincenzo Savona

Summary: In this study, we develop a quantum-mechanical model of dissipative Kerr solitons in ring microresonators and investigate the model using the truncated Wigner method. We find that the soliton experiences a finite coherence time due to quantum fluctuations originating from losses. Interpreting the results in terms of the theory of open quantum systems allows us to estimate the Liouvillian spectrum of the system, which is characterized by a set of eigenvalues with finite imaginary parts and vanishing real parts in the limit of vanishing quantum fluctuations. This feature indicates that dissipative Kerr solitons are a specific class of dissipative time crystals.

PHYSICAL REVIEW A (2022)

Article Materials Science, Multidisciplinary

Supersolidity in the second layer of para-H2 adsorbed on graphite

M. C. Gordillo, J. Boronat

Summary: The phase diagram of the second layer of para-H-2 adsorbed on graphite was calculated using quantum Monte Carlo methods. The study revealed that this nearly two-dimensional crystal exhibits a finite superfluid density at a certain total density, which can be experimentally observed.

PHYSICAL REVIEW B (2022)

Article Physics, Multidisciplinary

Dynamics of equilibration and collisions in ultradilute quantum droplets

V Cikojevic, L. Vranjes Markic, M. Pi, M. Barranco, F. Ancilotto, J. Boronat

Summary: This study investigates the dynamical equilibration and binary head-on collisions of quantum droplets made of a K-39 - K-39 Bose mixture using time-dependent density-functional theory. Important effects of initial population ratio deviation from the optimal mean-field value are extensively explored. The study shows sensitivity to an initial nonoptimal concentration and proposes a two-component approach for addressing situations with three-body losses mainly acting on one of the mixture's components.

PHYSICAL REVIEW RESEARCH (2021)

Article Optics

Dilute quantum liquid in a K-Rb Bose mixture

V Cikojevic, E. Poli, F. Ancilotto, L. Vranjes Markic, J. Boronat

Summary: The study focuses on a quantum liquid in a heterogeneous mixture of K-41 and Rb-87 atoms, using diffusion Monte Carlo and density-functional theory to investigate its properties and characteristics. It verifies the perturbative Lee-Huang-Yang term for a heterogeneous mixture and presents extensions to Lee-Huang-Yang corrected mean-field energy functionals based on bulk mixture equations of state calculated with diffusion Monte Carlo. Systematic comparison between different functionals is carried out using density-functional theory, with a focus on critical atom number, surface tension, surface width, Tolman length, and compressibility within the stability domain of the liquid mixture.

PHYSICAL REVIEW A (2021)

Article Optics

Finite-range effects in the two-dimensional repulsive Fermi polaron

Raul Bombin, Viktor Cikojevic, Juan Sanchez-Baena, Jordi Boronat

Summary: This study focuses on the repulsive Fermi polaron in a two-component, two-dimensional system of fermionic atoms, investigating properties such as polaron energy, quasiparticle residue, and effective mass using the diffusion Monte Carlo method. The results highlight the importance of considering the effective range and scattering length to reproduce experimental results, as well as the establishment of universality through different model potentials for the interaction between the Fermi sea and the impurity. This underscores the significance of quantum fluctuations and beyond mean-field effects in accurately describing the Fermi polaron problem.

PHYSICAL REVIEW A (2021)

Article Materials Science, Multidisciplinary

Estimation of the condensate fraction from the static structure factor

Yu E. Lozovik, I. L. Kurbakov, G. E. Astrakharchik, J. Boronat

Summary: The proposed method provides an accurate estimation of the condensate fraction in strongly correlated systems under various conditions, with experimental measurements confirming its effectiveness.

PHYSICAL REVIEW B (2021)

Article Optics

Structural superfluid-Mott-insulator transition for a Bose gas in multirods

Omar Abel Rodriguez-Lopez, M. A. Solis, J. Boronat

Summary: We study the structural superfluid-Mott-insulator quantum phase transition of an interacting one-dimensional Bose gas within multirod lattices, and use the ab initio diffusion Monte Carlo method to calculate relevant parameters. We find that varying the width of barriers from zero to the length of the potential period can induce the SF-MI phase transition.

PHYSICAL REVIEW A (2021)

Article Optics

Dissipative time crystal in an asymmetric nonlinear photonic dimer

Kilian Seibold, Riccardo Rota, Vincenzo Savona

PHYSICAL REVIEW A (2020)

No Data Available